The city is dirty. Sanitize your hands after touching it.

Sure, there are studies that say that hand sanitizer isn't 100% effective, but the fact is you're going to want it sometimes, even if it's only to make you feel better about that disgusting thing you just touched by accident.

A journal for writing down important work notes or thoughts throughout the day.

Sure, you could just use your phone for such things, but there's nothing quite like an old-fashioned, high-quality notebook to write on. You'll look more professional, too, and not like you're sending off a text message.